[issue34535] queue.Queue(timeout=0.001) avg delay Windows:14.5ms, Ubuntu: 0.063ms
New submission from Paul Overing :
I have found that using timeout with a python queue.Queue() results in an
average delay of 14.5ms in Windows over Ubuntu in python 3.6.5/3.7, I
subtracted the 1 ms timeout.
I have also tried datetime.datetime.now() to measure the time, with similar
results.
Does that make sense?
import queue
import time
max=0
min=1
num = 1
sum = 0
for x in range(1):
q = queue.Queue()
start = time.perf_counter()
try:
msg = q.get(block=True, timeout=.001)
except:
end = time.perf_counter()
chng = end-start -.001
if chng > max:
max = chng
if chng < min:
min = chng
sum = sum + chng
print(f"Avg: {sum/num}")
print(f"Min: {min}")
print(f"Max: {max}")
Results:
Window 10, Python 3.6.5/3.7
Avg: 0.014549868429997701
Min: 0.00167414200046
Max: 0.1389025150284
Ubuntu 16.04, Python 3.6.5/3.7
Avg: 6.275181290839012e-05
Min: 4.89290034456644e-05
Max: 8.690999695681965e-05
--
components: Windows
messages: 324277
nosy: Gammaguy, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: queue.Queue(timeout=0.001) avg delay Windows:14.5ms, Ubuntu: 0.063ms
type: performance
versions: Python 3.6, Python 3.7
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[issue34535] queue.Queue(timeout=0.001) avg delay Windows:14.5ms, Ubuntu: 0.063ms
Paul Overing added the comment: Thank you for your quick response. But 1ms resolution or not, 14.5ms does not seem reasonable given that in Ubuntu it is 0.049ms. Ubuntu is on average 295x faster. Also the variability in times is much higher in Windows max/avg = 9.547, avg/min = 8.69. It makes the windows queue.Queue implementations with timeouts unusable in low latency environments and should be documented as such. As it is slow and highly variable. -- ___ Python tracker <https://bugs.python.org/issue34535> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34535] queue.Queue(timeout=0.001) avg delay Windows:14.5ms, Ubuntu: 0.063ms
Paul Overing added the comment: Thank you to everyone for looking at my issue esp Josh.r for the detailed response. I now understand the issue and I just wanted to bring it to the group's attention for everyone's benefit. Vstinner is correct; Linux is my solution as it is my production environment but I was using my windows laptop for dev as I've been doing frequent Asia trips lately and noticed the difference. -- ___ Python tracker <https://bugs.python.org/issue34535> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
